A mold core structure of an automobile air duct seat injection mold

Abstract

The present application relates to injection mold technical field, specifically, it is a kind of automobile air pipe seat injection mold core structure, including respectively upper and lower settings and mutually cooperate movable die and fixed die, and be located between movable die and fixed die and mutually cooperate core assembly and core-pulling assembly;Core assembly includes in vertical plane along the direction of circular arc slidingly embedded in the top of fixed die arc-shaped core block and is located in the left side of fixed die and is connected with arc-shaped core block to drive arc-shaped core block reciprocating arc-shaped sliding transmission unit;Core-pulling assembly includes being located in the right of fixed die guide seat, slidingly connected in the first slider in guide seat, and fixed on the core-pulling oil cylinder of guide seat;Arc-shaped core block and first slider between still be provided with slot hole forming module;The present application is formed by slot hole forming module with the buckle slot of position setting towards fixed die direction one-time forming, both improve production efficiency, and ensure processing precision.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and more specifically, to a core structure of an injection mold for an automotive air duct seat. Background Technology

[0002] Automotive duct mounts typically refer to the mounting bases and interface components used to fix, connect, or seal ducts in automotive air conditioning or heating systems. They are commonly found in seat ventilation duct fixing, dashboard duct connection, or corrugated pipe sealing connections. To facilitate production and reduce costs, almost all automotive duct mounts on the market are made of plastic. Like other plastic parts, automotive duct mounts are also made using injection molding processes and with the help of matching injection molds.

[0003] To connect with the air duct, a snap-fit ​​groove is designed on one edge of the end opening of the duct seat. However, in the injection mold, in order to facilitate the demolding of the duct seat, the snap-fit ​​groove is positioned towards the fixed mold core. Since the interior of the fixed mold core must reserve space for the ejection mechanism to ensure its normal operation, it is difficult to install a core-pulling mechanism to complete the forming of the snap-fit ​​groove. Therefore, the existing snap-fit ​​grooves are all processed by grooving after the duct seat is formed, which is both time-consuming and labor-intensive, resulting in low production efficiency. In addition, the grooving process has a larger processing error compared to the one-piece molding method, which also affects the processing accuracy, and urgently needs to be solved. Summary of the Invention

[0004] In view of the current status of the prior art, the technical problem to be solved by the present invention is to provide a core structure for an automotive duct seat injection mold that can form a snap-fit ​​groove with its position facing the fixed mold core in one step, thereby saving costs and avoiding interference with the ejection mechanism, thus achieving the effects of saving time and effort and improving production efficiency, while reducing processing errors and ensuring processing accuracy.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a core structure of an injection mold for an automotive air duct seat, comprising a moving mold core and a fixed mold core respectively arranged above and below and cooperating with each other, and a core assembly and a core pulling assembly arranged between the moving mold core and the fixed mold core and cooperating with each other; The core assembly includes an arc-shaped core block that is slidably embedded in the top of the fixed mold core along the arc direction in a vertical plane, and a transmission unit located on the left side of the fixed mold core and connected to the arc-shaped core block to drive the arc-shaped core block to reciprocate in an arc-shaped sliding motion. The right end of the arc-shaped core block has a square conical cavity. The core-pulling assembly includes a guide seat located to the right of the fixed mold core, a first slider slidably connected in the guide seat in the left-right direction, and a core-pulling cylinder fixed on the guide seat. The telescopic end of the core-pulling cylinder is arranged laterally to the left and fixed on the first slider. A linear core block is formed outward on the left side of the first slider, and a square cone protrusion that cooperates with the square cone cavity is formed to the left at the end of the linear core block. A slot forming module is also provided between the arc-shaped core block and the first slider. The slot forming module includes a first straight rack that is horizontally fixed to the end of the square conical protrusion, an arc-shaped rack that slides along the arc direction in the vertical plane inside the arc-shaped core block, a core-pulling gear that is rotatably connected inside the arc-shaped core block and located above the right end of the arc-shaped rack, and an insert that is radially inserted into the lower right side of the arc-shaped core block. The upper end of the insert is slidably connected to the lower left side of the arc-shaped rack along the vertical tilt direction. The end of the first straight rack is movably inserted into the right end of the arc-shaped core block. The straight tooth surface of the first straight rack is set downward and cooperates with the circumferential tooth surface of the core-pulling gear. The arc-shaped outer wall tooth surface of the arc-shaped rack is set upward and meshes with the circumferential tooth surface of the core-pulling gear.

[0006] Preferably, the transmission unit includes a transmission seat fixed on the left outer wall of the fixed mold core, a second linear rack inserted and connected in the transmission seat in a vertical direction, a transmission gear rotatably connected inside the transmission seat and located to the right of the second linear rack, and an arc-shaped transmission block slidably embedded in the left side of the fixed mold core in a circular arc direction on a vertical plane and concentrically distributed with the arc-shaped core block. The straight tooth surface of the second linear rack is set to the right and meshes with the circumferential tooth surface of the transmission gear. The arc-shaped transmission block has an arc-shaped transmission tooth surface that meshes with the circumferential tooth surface of the transmission gear on its arc-shaped outer wall. The left end of the arc-shaped core block is fixed to the upper end of the arc-shaped transmission block.

[0007] Preferably, the core-pulling assembly further includes a second slider that is slidably connected in the guide seat in the left-right direction and fixed to the bottom of the first slider, two inserts fixed to the left side of the second slider and symmetrically arranged front and back, and two core strips respectively fixed to the lower side of the two inserts and symmetrically arranged front and back. A forming groove is provided on the right outer wall of the fixed mold core, and the ends of the two inserts and the left ends of the two core strips cooperate with the left inner wall of the forming groove.

[0008] Preferably, two symmetrically distributed demolding components are provided between the moving mold core and the fixed mold core. The demolding components include a third slider that is slidably connected to the front or rear side of the fixed mold core in the front-back direction, a guide rod that is inserted into the third slider in the up-down direction and located in front or rear side of the moving mold core, and a stop block fixed on the outer wall of the third slider facing the fixed mold core. The top of the stop block forms a stop strip, and the end of the stop strip forms a pad block facing the fixed mold core.

[0009] Preferably, the top left side of the fixed mold core is provided with a parting groove distributed in a front-to-back direction, and the arc-shaped core block is slidably embedded in the middle section of the top opening of the parting groove in a circular arc direction on a vertical plane, and the baffles on the baffles in the two demolding components are respectively movably inserted into the two ends of the parting groove.

[0010] Preferably, the top of the baffle has an arc-shaped parting surface, which cooperates with the upper arc-shaped outer wall of the arc-shaped core block, and the top of the pad has an arc-shaped guide surface, which cooperates with the lower arc-shaped outer wall of the arc-shaped core block.

[0011] Preferably, a transmission cavity is formed inside the right end of the arc-shaped core block, and the core-pulling gear is rotatably connected inside the transmission cavity. A slotted through hole that is laterally distributed and cooperates with the first straight rack is opened between the right inner wall of the transmission cavity and the bottom surface of the square conical cavity.

[0012] Preferably, an arc-shaped guide cavity is formed at the lower left corner of the transmission cavity, and the arc-shaped rack is slidably connected inside the arc-shaped guide cavity along the arc direction, with the right end of the arc-shaped rack extending into the transmission cavity.

[0013] Preferably, a recessed cavity is provided on the lower left side of the arc-shaped rack, and the upper end of the insert extends movably into the recessed cavity. A symmetrically distributed oblique slot is provided on the inner wall of both the front and rear sides of the recessed cavity. A transversely distributed pin is also inserted and fixed at the upper end of the insert, and the two ends of the pin are respectively movably inserted into the two oblique slots.

[0014] Compared with the prior art, the advantages of the present invention are as follows: This invention, while ensuring smooth demolding of the duct seat, utilizes a slot forming module to form the snap-fit ​​groove positioned towards the fixed mold core in one step, and relies on the core-pulling cylinder in the core-pulling assembly for driving. This eliminates the need for additional cylinders, saving costs, and fully utilizes the internal space of the arc-shaped core block to avoid occupying the space of the fixed mold core and preventing interference with the ejection mechanism. Furthermore, it eliminates the need for a separate grooving process to process the snap-fit ​​groove after the duct seat is ejected, thus achieving time and labor savings, improving production efficiency, reducing processing errors, and ensuring processing accuracy. Attached Figure Description

[0015] The above and other features, advantages, and aspects of the embodiments of this application will become more apparent when taken in conjunction with the accompanying drawings and the following detailed description; throughout the drawings, the same or similar reference numerals denote the same or similar elements; it should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale; in the drawings: Figure 1 This is an exploded top view of the left front side of the present invention; Figure 2 This is an exploded front cross-sectional view of the arc-shaped core block and slot forming module of the present invention. Figure 3 This is an exploded structural diagram of the right front side of the present invention, viewed from below. Detailed Implementation

[0016] The embodiments of this application will now be described in more detail with reference to the accompanying drawings. Although some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the accompanying drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0017] It should be understood that the various steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown, and the scope of this application is not limited in this respect.

[0018] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the relevant definitions of other terms will be given in the description below.

[0019] It should be noted that the concepts of "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0020] It should be noted that the terms "a" and "a plurality of" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0021] like Figures 1 to 3As shown, a core structure of an injection mold for an automotive air duct seat includes a moving mold core 2 and a fixed mold core 1 that are respectively arranged above and below each other and cooperate with each other, as well as a core assembly 3 and a core pulling assembly 4 that are arranged between the moving mold core 2 and the fixed mold core 1 and cooperate with each other. The core assembly 3 includes an arc-shaped core block 35 that is slidably embedded in the top of the fixed mold core 1 along the arc direction on the vertical plane, and a transmission unit located on the left side of the fixed mold core 1 and connected to the arc-shaped core block 35 to drive the arc-shaped core block 35 to reciprocate in an arc-shaped sliding manner. A square conical cavity 351 is provided at the right end of the arc-shaped core block 35. The core-pulling assembly 4 includes a guide seat 41 located to the right of the fixed mold core 1, a first slider 44 slidably connected in the guide seat 41 in the left-right direction, and a core-pulling cylinder 43 fixed on the guide seat 41. The telescopic end of the core-pulling cylinder 43 is arranged laterally to the left and fixed on the first slider 44. A linear core block 441 is formed outward on the left side of the first slider 44, and a square pyramidal protrusion 442 that cooperates with the square pyramidal cavity 351 is formed to the left at the end of the linear core block 441. A slot forming module 6 is also provided between the arc-shaped core block 35 and the first slider 44. The slot forming module 6 includes a first straight rack 61 that is horizontally fixed to the end of the square pyramidal protrusion 442, an arc-shaped rack 63 that slides along the arc direction in the vertical plane inside the arc-shaped core block 35, a core-pulling gear 62 that is rotatably connected inside the arc-shaped core block 35 and located above the right end of the arc-shaped rack 63, and an insert 64 that is radially inserted into the lower right side of the arc-shaped core block 35. The upper end of the insert 64 is slidably connected to the lower left end of the arc-shaped rack 63 along the vertical tilt direction. The end of the first straight rack 61 is movably inserted into the right end of the arc-shaped core block 35. The straight tooth surface of the first straight rack 61 is set downward and cooperates with the circumferential tooth surface of the core-pulling gear 62. The arc-shaped outer wall tooth surface of the arc-shaped rack 63 is set upward and meshes with the circumferential tooth surface of the core-pulling gear 62.

[0022] The transmission unit includes a transmission seat 31 fixed on the left outer wall of the fixed mold core 1, a second linear rack 32 inserted and connected in the transmission seat 31 in the vertical direction, a transmission gear 33 rotatably connected inside the transmission seat 31 and located to the right of the second linear rack 32, and an arc-shaped transmission block 34 slidably embedded in the left side of the fixed mold core 1 in the arc direction on the vertical plane and concentrically distributed with the arc-shaped core block 35. The straight tooth surface of the second linear rack 32 is set to the right and meshes with the circumferential tooth surface of the transmission gear 33. The arc-shaped outer wall of the arc-shaped transmission block 34 has an arc-shaped transmission tooth surface 341 that meshes with the circumferential tooth surface of the transmission gear 33. The left end of the arc-shaped core block 35 is fixed to the upper end of the arc-shaped transmission block 34.

[0023] The core-pulling assembly 4 also includes a second slider 42 that is slidably connected in the guide seat 41 and fixed to the bottom of the first slider 44 in the left-right direction, two inserts 45 that are fixed to the left side of the second slider 42 and symmetrically arranged in front and behind, and two core strips 46 that are respectively fixed to the lower side of the two inserts 45 and symmetrically arranged in front and behind. A forming groove 101 is provided on the right outer wall of the fixed mold core 1. The ends of the two inserts 45 and the left ends of the two core strips 46 are engaged with the left inner wall of the forming groove 101.

[0024] Two symmetrically distributed demolding components 5 are provided between the moving mold core 2 and the fixed mold core 1. The demolding components 5 include a third slider 51 that is slidably connected to the front or rear side of the fixed mold core 1 in the front-back direction, a guide rod 53 that is inserted into the third slider 51 in the up-down direction and located in the front or rear side of the moving mold core 2, and a stop block 52 fixed on the outer wall of the third slider 51 facing the fixed mold core 1. A stop strip 521 is formed on the top of the stop block 52, and a pad block 523 is formed at the end of the stop strip 521 facing the fixed mold core 1.

[0025] The top left side of the fixed mold core 1 is provided with a parting groove 102 distributed in a front-to-back direction. The arc-shaped core block 35 is slidably embedded in the middle section of the top opening of the parting groove 102 along the arc direction on the vertical plane. The baffles 521 on the baffles 52 in the two demolding components 5 are respectively movably inserted into the two ends of the parting groove 102.

[0026] The top of the baffle 521 has an arc-shaped parting surface 521, which cooperates with the upper arc-shaped outer wall of the arc-shaped core block 35. The top of the pad block 523 has an arc-shaped guide surface 524, which cooperates with the lower arc-shaped outer wall of the arc-shaped core block 35.

[0027] A pressure block 7 is fixed on the top left side of the fixed mold core 1, located above the arc-shaped transmission block 34. A limiting groove 71, which is concentrically distributed with the arc-shaped transmission block 34, is provided at the lower right corner of the pressure block 7. The upper right side of the arc-shaped transmission block 34 is movably embedded in the limiting groove 71.

[0028] The bottom of the fixed mold core 1 is also fixed with a support block 8 located to the right of the arc-shaped transmission block 34. A limiting arc surface 81 is formed at the lower left corner of the support block 8. The limiting arc surface 81 is concentrically set with the arc-shaped inner wall of the arc-shaped transmission block 34 and cooperates with each other.

[0029] A mold core structure for an automotive air duct seat injection mold further includes a limiting block 9 that is movable in the vertical direction below the fixed mold core 1, and the top of the limiting block 9 cooperates with the lower end of the arc-shaped transmission block 34.

[0030] A transmission cavity 352 is formed inside the right end of the arc-shaped core block 35. The core-pulling gear 62 is rotatably connected inside the transmission cavity 352. A slotted through hole 353 is opened between the right inner wall of the transmission cavity 352 and the bottom surface of the square conical cavity 351, which is laterally distributed and cooperates with the first straight rack 61.

[0031] An arc-shaped guide cavity 354 is formed at the lower left corner of the transmission cavity 352. An arc-shaped rack 63 is slidably connected to the inside of the arc-shaped guide cavity 354 along the arc direction, and the right end of the arc-shaped rack 63 extends into the inside of the transmission cavity 352.

[0032] A recessed cavity 631 is provided on the lower left side of the arc-shaped rack 63. The upper end of the insert 64 extends movably into the recessed cavity 631. A symmetrically distributed inclined slot hole 632 is provided on the inner wall of the front and rear sides of the recessed cavity 631. A transversely distributed pin 65 is also inserted and fixed at the upper end of the insert 64. The two ends of the pin 65 are respectively movably inserted into the two inclined slot holes 632.

[0033] Working principle: The moving mold core 2 and the fixed mold core 1 are respectively installed on the moving module and the fixed module of the automotive air duct seat injection mold, and the upper end of the guide rod 53 in each demolding assembly 5 and the upper end of the second linear rack 32 in the transmission unit are fixed on the moving module; then the moving module is driven to move downward to gradually approach the fixed module until the two are joined together. At this time, the end face of the moving mold core 2 and the end face of the fixed mold core 1 also fit together to complete the mold closing (existing technology).

[0034] Before the mold is closed, the right end of the arc-shaped core block 35 in the core assembly 3 has not yet entered the parting groove 102 and is located on the left side of the parting groove 102. The lower end of the arc-shaped transmission block 34 rotates to the bottom of the fixed mold core 1, while the limiting block 9 is at the lower limit. When the moving module moves down, the second linear rack 32 will move synchronously with the moving module, thereby driving the transmission gear 33 to rotate. Thus, by means of the meshing connection between the arc-shaped transmission tooth surface 341 and the circumferential tooth surface of the transmission gear 33, the arc-shaped transmission block 34 is driven to rotate clockwise, thereby driving the arc-shaped core block 35 to rotate synchronously so that its right end gradually rotates to the top opening of the parting groove 102.

[0035] During this process, each guide rod 53 also moves synchronously with the moving module, thereby forcing the third slider 51 in each demolding assembly 5 to translate towards the arc-shaped core block 35 until the ends of the stop strips 521 on each stop block 52 are attached to the front or rear outer wall of the arc-shaped core block 35. At this time, the ends of the two pads 523 are attached to each other and are located below the arc-shaped core block 35. The arc-shaped parting surface 521 on the pad 523 slides against the lower arc-shaped outer wall of the arc-shaped core block 35. Then the driving limit block 9 moves upward until it abuts against the lower end of the arc-shaped transmission block 34 to prevent it from shifting.

[0036] Next, the telescopic end of the core-pulling cylinder 43 in the core-pulling assembly 4 extends outward to drive the first slider 44 and the second slider 42 to move to the left until the end of the linear core block 441 on the first slider 44 is attached to the outer wall of the right end of the arc-shaped core block 35. At this time, the square pyramidal protrusion 442 is embedded in the square pyramidal cavity 351, and the ends of the two inserts 45 and the left ends of the two core bars 46 also extend into the interior of the forming groove 101.

[0037] When the first slider 44 moves to the left, the end of the first straight rack 61 in the slot forming module 6 is inserted into the transmission cavity 352 through the slotted through hole 353. When the straight tooth surface of the first straight rack 61 meshes with the circumferential tooth surface of the core-pulling gear 62, it will drive the core-pulling gear 62 to rotate counterclockwise. Then, through the mutual meshing connection between the arc-shaped outer wall tooth surface of the arc rack 63 and the circumferential tooth surface of the core-pulling gear 62, the arc rack 63 will rotate clockwise inside the arc-shaped guide cavity 354. Thus, through the two oblique slots 632 on the arc rack 63, the pin 65 is forced to slide along the two oblique slots 632, thereby driving the insert 64 to move radially downward along the arc-shaped core block 35 until the lower end of the insert 64 extends into the lower outside of the arc-shaped core block 35 and fits against the arc-shaped guide surface 524 on the two pads 523.

[0038] Next, the molten material enters the space between the moving mold core 2 and the fixed mold core 1 through the gate on the feed plate in the injection mold and the runner on the moving mold core. After cooling and molding, it forms the air duct seat (existing technology) used in automobiles. The arc-shaped core block 35 is used to form the arc-shaped part of the air duct seat. The insert block 64 forms a snap-fit ​​groove for assembly on the lower side of the opening at the left end of the air duct seat.

[0039] After molding, the telescopic end of the core-pulling cylinder 43 is first driven to retract inward, thereby driving the first linear rack 61 to move to the right until it leaves the slotted through hole 353. Then, the core-pulling gear 62 drives the arc-shaped rack 63 to rotate counterclockwise, thereby driving the insert 64 to move in the opposite direction to reset through the cooperation of the pin 65 and the two oblique slots 632, thus realizing the core-pulling of the snap-fit ​​slot. Then, the driving module is driven to move upward to leave the fixed module and drive the limiting block 9 to move downward, thereby driving each guide rod 53 and the second linear rack 61 to move to the right until they leave the slot. The racks 32 move upward, thereby forcing the two stops 52 to move back and reset in a direction away from the arc-shaped core block 35 so that the ends of the two pads 523 separate from each other and move away from the bottom of the arc-shaped core block 35; the second straight rack 32 will similarly drive the arc-shaped transmission block 34 to rotate counterclockwise, thereby driving the arc-shaped core block 35 to rotate synchronously so that its right end gradually turns to come out from the left end opening of the duct seat, until the lower end of the arc-shaped transmission block 34 contacts the bottom of the fixed mold core 1, thus completing the core pulling of the arc-shaped section of the duct seat.

[0040] This invention, while ensuring smooth demolding of the duct seat, uses the slot forming module 6 to form the snap-fit ​​groove positioned towards the fixed mold core in one go, and relies on the core-pulling cylinder 43 in the core-pulling assembly 4 for driving. This eliminates the need to add a cylinder, thus saving costs, and makes full use of the internal space of the arc-shaped core block 35 to avoid occupying the space of the fixed mold core 1 and to prevent interference with the ejection mechanism. Moreover, it eliminates the need to arrange a separate grooving process to process the snap-fit ​​groove after the duct seat is ejected, thereby achieving the effects of saving time and labor, improving production efficiency, reducing processing errors, and ensuring processing accuracy.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A core structure for an injection mold of an automotive air duct seat, comprising a moving mold core and a fixed mold core respectively arranged vertically and cooperating with each other, and a core assembly and a core-pulling assembly disposed between the moving mold core and the fixed mold core and cooperating with each other, characterized in that: The core assembly includes an arc-shaped core block that is slidably embedded in the top of the fixed mold core along the arc direction in a vertical plane, and a transmission unit located on the left side of the fixed mold core and connected to the arc-shaped core block to drive the arc-shaped core block to reciprocate in an arc-shaped sliding motion. The right end of the arc-shaped core block has a square conical cavity. The core-pulling assembly includes a guide seat located to the right of the fixed mold core, a first slider slidably connected in the guide seat in the left-right direction, and a core-pulling cylinder fixed on the guide seat. The telescopic end of the core-pulling cylinder is arranged laterally to the left and fixed on the first slider. A linear core block is formed outward on the left side of the first slider, and a square cone protrusion that cooperates with the square cone cavity is formed to the left at the end of the linear core block. A slot forming module is also provided between the arc-shaped core block and the first slider. The slot forming module includes a first straight rack that is horizontally fixed to the end of the square conical protrusion, an arc-shaped rack that slides along the arc direction in the vertical plane inside the arc-shaped core block, a core-pulling gear that is rotatably connected inside the arc-shaped core block and located above the right end of the arc-shaped rack, and an insert that is radially inserted into the lower right side of the arc-shaped core block. The upper end of the insert is slidably connected to the lower left side of the arc-shaped rack along the vertical tilt direction. The end of the first straight rack is movably inserted into the inside of the right end of the arc-shaped core block. The straight tooth surface of the first straight rack is set downward and cooperates with the circumferential tooth surface of the core-pulling gear. The arc-shaped outer wall tooth surface of the arc-shaped rack is set upward and meshes with the circumferential tooth surface of the core-pulling gear.

2. The core structure of an injection mold for an automotive air duct seat according to claim 1, characterized in that, The transmission unit includes a transmission seat fixed on the left outer wall of the fixed mold core, a second linear rack inserted and connected in the transmission seat in a vertical direction, a transmission gear rotatably connected inside the transmission seat and located to the right of the second linear rack, and an arc-shaped transmission block slidably embedded in the left side of the fixed mold core in a circular arc direction on a vertical plane and concentrically distributed with the arc-shaped core block. The straight tooth surface of the second linear rack is set to the right and meshes with the circumferential tooth surface of the transmission gear. The arc-shaped transmission block has an arc-shaped transmission tooth surface that meshes with the circumferential tooth surface of the transmission gear on its arc-shaped outer wall. The left end of the arc-shaped core block is fixed to the upper end of the arc-shaped transmission block.

3. The core structure of an injection mold for an automotive air duct seat according to claim 1, characterized in that, The core-pulling assembly also includes a second slider that is slidably connected in the guide seat and fixed at the bottom of the first slider in the left-right direction, two inserts fixed to the left side of the second slider and symmetrically arranged front and back, and two core strips respectively fixed to the lower side of the two inserts and symmetrically arranged front and back. A forming groove is provided on the right outer wall of the fixed mold core. The ends of the two inserts and the left ends of the two core strips cooperate with the left inner wall of the forming groove.

4. The core structure of an injection mold for an automotive air duct seat according to claim 1, characterized in that, Two symmetrically distributed demolding components are provided between the moving mold core and the fixed mold core. Each demolding component includes a third slider that is slidably connected to the front or rear side of the fixed mold core in the front-back direction, a guide rod that is inserted into the third slider in the up-down direction and located in front or rear side of the moving mold core, and a stop block fixed on the outer wall of the third slider facing the fixed mold core. The top of the stop block forms a stop strip, and the end of the stop strip forms a pad block facing the fixed mold core.

5. The core structure of an injection mold for an automotive air duct seat according to claim 4, characterized in that, The top left side of the fixed mold core is provided with a parting groove distributed in a front-to-back direction. The arc-shaped core block is slidably embedded in the middle section of the top opening of the parting groove in a vertical plane along the arc direction. The baffles on the baffles in the two demolding components are respectively movably inserted into the two ends of the parting groove.

6. The core structure of an injection mold for an automotive air duct seat according to claim 4, characterized in that, The top of the baffle has an arc-shaped parting surface, which cooperates with the upper arc-shaped outer wall of the arc-shaped core block. The top of the pad has an arc-shaped guide surface, which cooperates with the lower arc-shaped outer wall of the arc-shaped core block.

7. The core structure of an injection mold for an automotive air duct seat according to claim 1, characterized in that, The right end of the arc-shaped core block has a transmission cavity, and the core-pulling gear is rotatably connected inside the transmission cavity. The right inner wall of the transmission cavity and the bottom surface of the square conical cavity are provided with transversely distributed slotted through holes that cooperate with the first straight rack.

8. The core structure of an injection mold for an automotive air duct seat according to claim 7, characterized in that, An arc-shaped guide cavity is formed at the lower left corner of the transmission cavity. The arc-shaped rack is slidably connected inside the arc-shaped guide cavity along the arc direction, and the right end of the arc-shaped rack extends into the transmission cavity.

9. The core structure of an injection mold for an automotive air duct seat according to claim 1, characterized in that, A recessed cavity is provided on the lower left side of the arc-shaped rack. The upper end of the insert extends movably into the recessed cavity. A symmetrically distributed oblique slot is provided on the inner wall of both the front and rear sides of the recessed cavity. A horizontally distributed pin is also inserted and fixed at the upper end of the insert. The two ends of the pin are respectively movably inserted into the two oblique slots.

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